travis: add and run script which checks if listed files contain "unwrap". Should fix #10446.

.travis.yml

@@ -16,6 +16,7 @@ matrix:
          - ./mach test-compiletest
          - bash etc/ci/lockfile_changed.sh
          - bash etc/ci/manifest_changed.sh
+         - bash etc/ci/check_no_unwrap.sh
       cache:
         directories:
           - .cargo

etc/ci/check_no_unwrap.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+#
+# Make sure listed files do not contain "unwrap"
+set -o errexit
+set -o nounset
+set -o pipefail
+
+cd $(git rev-parse --show-toplevel) # cd into repo root so make sure paths works in any case
+
+# files that should not contain "unwrap"
+FILES=("components/compositing/compositor.rs"
+       "components/compositing/pipeline.rs"
+       "components/compositing/constellation.rs")
+
+! grep -n "unwrap(" "${FILES[@]}"